Morphological properties of two-dimensional and three-dimensional bedforms in open channel flow: A flume experiments study
Bedforms are formed by sediment particles under the action of flow, which in turn affect flow and sediment movement. However, the fundamental mechanisms behind the formation and development of bedforms under varying flow conditions, the interconnection between sediment particle movement and bed morp...
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KeAi Communications Co., Ltd.
2025-02-01
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| Series: | International Journal of Sediment Research |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1001627924001033 |
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| author | Wenhong Cao Xu Geng Chunjing Liu Lingfeng Zhang |
| author_facet | Wenhong Cao Xu Geng Chunjing Liu Lingfeng Zhang |
| author_sort | Wenhong Cao |
| collection | DOAJ |
| description | Bedforms are formed by sediment particles under the action of flow, which in turn affect flow and sediment movement. However, the fundamental mechanisms behind the formation and development of bedforms under varying flow conditions, the interconnection between sediment particle movement and bed morphology development, as well as the influence of bedforms on flow and sediment transport, are still not well understood. In the current study, the moveable bed load transport flume experiments under different flow conditions were done, and the development processes of two-dimensional and three-dimensional dunes formed under different flow intensities were simulated. The detailed structure of the bedforms was measured by laser scanning technology, the characteristics of the bedforms were analyzed in detail, and the relations between the formation of the bedforms and the movement of sediment particles are discussed. The results found that the correlation coefficients of the longitudinal profile curve can serve as a quick reference for distinguishing two-dimensional and three-dimensional dunes. When the crestline ratio is used as the criterion for two-dimensional and three-dimensional dunes, the relative amplitude of the dune crestline and the included angle with the flow direction should also be comprehensively considered. The lee side angles of dunes calculated using the triangle generalization method and local section tangent method are compared and show that the values obtained by the former method are only about half of that of the latter. It is also found that the lee side angles of dunes are related to the dune height. The superimposed dunes generally exist in the downstream area of the stoss side of the dunes. The local bed slopes on the stoss side of the dunes show reverse slopes. The superimposed dunes improve the local bed height and further increase the reverse slope degree of the stoss side. A streamwise ridge is an important form located in the upstream area of the dunes stoss side, and they are symmetrically distributed on both sides. Multiple streamwise ridges divide the stoss side of the dunes into relatively independent movement areas, restricting the movement of sediment particles to specific regions. According to the distribution characteristics of bed morphologies, the effects of dunes on sediment particle movement and flow energy consumption are analyzed. |
| format | Article |
| id | doaj-art-c2efee81b19a4baa93dd12edc1b7fc52 |
| institution | Kabale University |
| issn | 1001-6279 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | International Journal of Sediment Research |
| spelling | doaj-art-c2efee81b19a4baa93dd12edc1b7fc522025-01-12T05:24:17ZengKeAi Communications Co., Ltd.International Journal of Sediment Research1001-62792025-02-014011530Morphological properties of two-dimensional and three-dimensional bedforms in open channel flow: A flume experiments studyWenhong Cao0Xu Geng1Chunjing Liu2Lingfeng Zhang3State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100048, China; Key Laboratory of Sediment Science and Northern River Training of Ministry of Water Resources, Beijing 100048, China; China Institute of Water Resources and Hydropower Research, Beijing 100048, ChinaState Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100048, China; Key Laboratory of Sediment Science and Northern River Training of Ministry of Water Resources, Beijing 100048, China; China Institute of Water Resources and Hydropower Research, Beijing 100048, ChinaState Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100048, China; Key Laboratory of Sediment Science and Northern River Training of Ministry of Water Resources, Beijing 100048, China; China Institute of Water Resources and Hydropower Research, Beijing 100048, China; Corresponding author.State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100048, China; Key Laboratory of Sediment Science and Northern River Training of Ministry of Water Resources, Beijing 100048, China; China Institute of Water Resources and Hydropower Research, Beijing 100048, ChinaBedforms are formed by sediment particles under the action of flow, which in turn affect flow and sediment movement. However, the fundamental mechanisms behind the formation and development of bedforms under varying flow conditions, the interconnection between sediment particle movement and bed morphology development, as well as the influence of bedforms on flow and sediment transport, are still not well understood. In the current study, the moveable bed load transport flume experiments under different flow conditions were done, and the development processes of two-dimensional and three-dimensional dunes formed under different flow intensities were simulated. The detailed structure of the bedforms was measured by laser scanning technology, the characteristics of the bedforms were analyzed in detail, and the relations between the formation of the bedforms and the movement of sediment particles are discussed. The results found that the correlation coefficients of the longitudinal profile curve can serve as a quick reference for distinguishing two-dimensional and three-dimensional dunes. When the crestline ratio is used as the criterion for two-dimensional and three-dimensional dunes, the relative amplitude of the dune crestline and the included angle with the flow direction should also be comprehensively considered. The lee side angles of dunes calculated using the triangle generalization method and local section tangent method are compared and show that the values obtained by the former method are only about half of that of the latter. It is also found that the lee side angles of dunes are related to the dune height. The superimposed dunes generally exist in the downstream area of the stoss side of the dunes. The local bed slopes on the stoss side of the dunes show reverse slopes. The superimposed dunes improve the local bed height and further increase the reverse slope degree of the stoss side. A streamwise ridge is an important form located in the upstream area of the dunes stoss side, and they are symmetrically distributed on both sides. Multiple streamwise ridges divide the stoss side of the dunes into relatively independent movement areas, restricting the movement of sediment particles to specific regions. According to the distribution characteristics of bed morphologies, the effects of dunes on sediment particle movement and flow energy consumption are analyzed.http://www.sciencedirect.com/science/article/pii/S1001627924001033BedformsDunesBedloadFlow structureSediment transport |
| spellingShingle | Wenhong Cao Xu Geng Chunjing Liu Lingfeng Zhang Morphological properties of two-dimensional and three-dimensional bedforms in open channel flow: A flume experiments study International Journal of Sediment Research Bedforms Dunes Bedload Flow structure Sediment transport |
| title | Morphological properties of two-dimensional and three-dimensional bedforms in open channel flow: A flume experiments study |
| title_full | Morphological properties of two-dimensional and three-dimensional bedforms in open channel flow: A flume experiments study |
| title_fullStr | Morphological properties of two-dimensional and three-dimensional bedforms in open channel flow: A flume experiments study |
| title_full_unstemmed | Morphological properties of two-dimensional and three-dimensional bedforms in open channel flow: A flume experiments study |
| title_short | Morphological properties of two-dimensional and three-dimensional bedforms in open channel flow: A flume experiments study |
| title_sort | morphological properties of two dimensional and three dimensional bedforms in open channel flow a flume experiments study |
| topic | Bedforms Dunes Bedload Flow structure Sediment transport |
| url | http://www.sciencedirect.com/science/article/pii/S1001627924001033 |
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